Live Allobaculum stercoricanis and its two postbiotic preparations (inactivated cells and cell-free supernatant) alleviated DSS-induced colitis in mice, and the authors hypothesize that α-muricholic acid may contribute through FXR engagement and suppression of the TLR4/NF-κB signaling pathway.
Live A. stercoricanis and its two postbiotic preparations alleviated DSS-induced colitis in mice.
Integrated gut microbiome and serum metabolomics analyses indicated that the interventions may act through bile acid metabolism and Toll-like receptor signaling pathways.
α-Muricholic acid (α-MCA) was identified as a candidate functional metabolite, with FXR as a potential target.
The authors hypothesize that α-MCA may ameliorate intestinal inflammation by engaging FXR and suppressing the TLR4/NF-κB signaling pathway.
Postbiotic preparations of A. stercoricanis are proposed as a therapeutic strategy for IBD, with advantages in biosafety and reproducibility over probiotics.
This study tested whether a gut bacterium called Allobaculum stercoricanis, and products made from it, could ease colitis in mice. Colitis was induced with DSS, a chemical commonly used to model inflammatory bowel disease (IBD). The researchers tested the live bacteria, heat-inactivated bacterial cells, and the liquid left after growing the bacteria (cell-free supernatant). All three reportedly reduced colitis in the mice. To explore how this might work, the researchers analysed gut microbes and blood metabolites. They also used computer-based methods to predict which bacterial compounds might be responsible. These pointed to bile acid handling and Toll-like receptor signaling, and to a bile acid called α-muricholic acid as a candidate active compound. It was predicted to interact with a receptor called FXR and to dampen an inflammatory pathway (TLR4/NF-κB). The authors present this as a hypothesis, and much of the support is computational. This research suggests that non-living bacterial products, called postbiotics, could be a route to treating IBD, and they may be safer and more consistent to produce than live probiotics. The work was done in mice, so it does not show whether the same effects occur in people. Further testing would be needed to confirm the proposed mechanism.
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Upload Your LabsWang T, Wang J, Huangfu B, He X, Huang K. (2026). Allobaculum stercoricanis and Its Postbiotics Alleviate Dextran Sulfate Sodium (DSS)-Induced Colitis through the Regulation of theTLR4/NF-κB Signaling Pathway.. Journal of agricultural and food chemistry. https://doi.org/10.1021/acs.jafc.6c01607